JP2572078B2 - Material testing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Work] The present invention calculates a load and a displacement detection signal, and displays a characteristic curve such as a load / displacement curve as a calculation result on a display device. About the machine.

[Prior art] In a material testing machine, analog signals from measurement detectors such as load detectors and displacement detectors are A / D converted and input to an arithmetic processing mechanism. Further, test conditions and data processing conditions are also entered on a keyboard. , An arithmetic process is performed by instructing and inputting the result, the result is stored in a graphic printer, and the state is displayed on a display.

As a display, a CTR display is usually used,
The measured values and the characteristic curves of the materials are displayed so that the measurement results can be immediately evaluated through visual observation. Also, CT
The characteristic curve displayed on the R is enlarged and displayed so that the evaluation can be easily performed.

[Problems to be Solved by the Invention] When the characteristic curve displayed on the CRT display is enlarged and displayed as described above, first, as shown in FIG. 5, the load display direction (Y axis) and the displacement display are performed. The value of the portion to be enlarged on each axis in the direction (X axis) is read from the displayed curve. In the illustrated example, the values of ba on the Y axis and dc on the X axis are reset to the full scale values of the X and Y axes, and an enlarged display as shown in FIG. 6 is performed. .

As described above, the setting of the full scale value requires a double operation of reading the value of the point to be enlarged from the display curve and further setting the value, resulting in a problem that the human operation becomes complicated. .

Accordingly, it is an object of the present invention to provide a material testing machine capable of easily performing the setting operation of the enlarged display.

[Means for Solving the Problems] The present invention employs the following configuration in order to solve the above problems.

That is, the material testing machine according to the present invention writes and stores the load and elongation sampling data from the load detector and the elongation detector during the material test in a memory, performs arithmetic processing, and outputs the arithmetic result to a display device such as a CTR. A material testing machine for displaying, wherein a movement instructing means for instructing movement of an indication display unit such as a cursor on a display device, and two arbitrary points on a characteristic curve displayed on the display device by the movement instructing device are designated. Means for reading the load and displacement data of the characteristic curve between any two specified points, and searching for the load and displacement data read by the reading means,
Detecting means for detecting the maximum value and the minimum value of the load and displacement data on the characteristic curve between the two designated points, and the maximum value and the minimum value detected by the detecting means become the full scale value of the display device. Computing means for computing each data value between the two points specified in the above.

[Operation] If the portion to be enlarged is designated by two points on the characteristic curve with respect to the characteristic curve displayed on the display device, the load / displacement data in the range specified by the reading means is read out, and the detecting means The maximum value and the minimum value in the range are detected, and the data in the specified range is converted and calculated by the calculating means so that the maximum value and the minimum value become the full scale value of the display device. If the characteristic curve is displayed based on the converted data, the enlarged display of the range designated by the cursor is automatically performed.

Embodiment FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention. An upper grip 3 and a lower grip 5 are attached to the crosshead 2 and the table 4 of the material testing machine 1,
The test piece 7 is gripped. The load applied to the test piece 7 by the movement of the crosshead 2 is detected by the load cell 8, and the elongation of the test piece 7 is detected by the elongation detector 9.

The load detection signal from the load cell 8 is amplified by the load amplifier 11 and input to the A / D converter 13. The displacement detection signal from the displacement detector 9 is amplified by the displacement amplifier 12 and input to the A / D converter 14. The load and displacement sampling data A / D converted by the A / D converters 13 and 14 are input to the CPU 16 and written to the RAM 18. The CPU 16 writes and reads data to and from the RAM 18 according to the processing program written in the ROM 17, performs arithmetic processing based on the data, and outputs the arithmetic result to the CRT display 22 via the I / O device 20. Display.

FIG. 3 illustrates a load-displacement characteristic curve displayed on the CRT 22. On the display screen, the cursor 25 can be moved to an arbitrary position on the screen by an instruction of the cursor movement key 21 as a cursor movement instruction means.

Then, when the cursor 25 is moved to specify a range to be enlarged and displayed on the characteristic curve, the enlarged display processing is performed according to the flowchart shown in FIG. That is, RAM18
The load-displacement characteristic curve obtained based on the load / displacement data written in the CRT 22 is displayed on a scale that falls within the display range on the CRT 22. Specify with two points. When the enlargement range is designated, the load data and the displacement data indicating the characteristic curve between the points P and Q are read from the RAM 18 by the CPU 16. The CPU 16 searches the read load data and displacement data to detect the maximum value and the minimum value (L _MAX , L _MIN ), (E _MAX , E _MIN ). Then, the scale is determined by calculating the values of L _MAX -L _MIN and E _MAX -E _MIN to be the full scale values of the Y axis and the X axis, and each data in the specified range is determined based on this scale. And the characteristic curve enlarged for the specified range is displayed as shown in FIG. As described above, the CPU 16 retrieves the data in the specified range, retrieves the read data, and detects the maximum value / minimum value, and calculates and enlarges the maximum value / minimum value to the full scale value. Function as calculation means for determining the scale to be performed.

As described above, according to the material testing machine according to the present invention, the load-displacement characteristic curve calculated and obtained based on the measurement data is displayed at the display position, so that the evaluation of the measurement result can be performed more easily. By simply designating an arbitrary portion on the characteristic curve with the cursor, the enlarged display of the designated range can be automatically performed.

[Effects of the Invention] As is clear from the above description, according to the material tester of the present invention, for a characteristic curve or the like displayed on the display device, if a portion to be enlarged is designated by two points on the curve, The load / displacement data in the specified range is read out by the reading means, and the maximum value and the minimum value in the range are detected by the detecting means, and the maximum value and the minimum value become the full scale value of the display device such as a CRT. As described above, since the enlarged display of the designated range of the characteristic curve is automatically performed, for example, in the load-displacement curve in the material test, from the load-displacement curve in the so-called slip stage that occurs after passing the upper yield point, When obtaining the load data necessary to evaluate the inertial effect in the material test, the range of the change in the load value at the sliding stage is from the state of the load value 0 (minimum load value) at the start of the test to the maximum. By specifying the range of the sliding stage, the load in this range can be specified by specifying the range of the sliding stage. -The maximum value and the minimum value of the displacement curve are detected, and the enlarged display of the specified range of the characteristic curve is automatically performed so that the maximum value and the minimum value become the full scale value of a display device such as a CRT. Therefore, by making full use of the performance of the display device such as the CTR, it is possible to sufficiently reduce the reading error of the load value in the sliding stage, and it is possible to efficiently perform the measurement operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
The figure is a flowchart showing a processing procedure for performing an enlarged display,
FIG. 3 is a diagram showing an example of a characteristic curve displayed on the display device;
FIG. 4 is a diagram illustrating an enlarged state of a designated range, and FIGS. 5 and 6 are explanatory diagrams of a conventional data enlarging method. 8: Load cell, 9: Displacement detector 16: CPU, 21: Cursor movement instruction means 22: CRT display

Claims (1)

(57) [Claims] 1. A material testing machine for writing and storing sampling data of load and elongation from a load detector and an elongation detector during a material test into a memory, performing arithmetic processing, and displaying the arithmetic result on a display device such as a CRT. Moving instruction means for instructing movement of an instruction display unit such as a cursor on the display device, and designating any two points on the characteristic curve displayed on the display device by the movement instruction means, and specifying the designated arbitrary Means for reading the load and displacement data of the characteristic curve between the two points, and the load read by the reading means;
Detecting displacement data, detecting means for detecting the maximum value and the minimum value of the displacement data, the load on the characteristic curve between two designated points, and the maximum value and the minimum value detected by the detecting means are displayed on the display device. A material testing machine comprising: a calculating means for converting each data value between two points designated to have a full scale value.